check out cryptominingtalk.com, its all in there!  Seriously I made it for those kind of questions.  Easy to modify your bios if you have hynix or samsung memory (check in gpu-z) with polaris bios editor and atiwinflash.  step by step guide is there.  MSI Afterburner is good, basically drop voltage down to -75mv to -96mv, or whatever gets you close to 0.95v to start.  Core and memory is pretty much stock, a bit overclocked, 1250/1750.  (armor 4g 470).  thats it  My other 470s/480s are anywhere from 160 to 175 though, I can't explain the variations though.